Sound radiator



March 19, 1935. OVENHAUSEN SOUND'RADIATOR Filed Sept. 9, 1931 Z 0mm h a(456/) Patented Mar. 19, 1935 UNITED STATES PATENT OFFICE SOUND RADIATORFranz Ovenhausen,

Steinheim, Germany 9 Claims.

The present invention relates to a. sound radiator, i. e. particularlyto the construction of a sound radiator of wood. Sound radiators of woodare already known. In conjunction with these, however, no attention hasbeen paid to the course taken by the veinage. In accordance with thepresent invention the sound radiators are made from veneering woodexhibiting a radial veinage. The production of such veneers has beendescribed in my American Patent 1,807,251. The present invention,however, is not to be limited to the employment of veneers beingproduced in accordance with that patent.

In the drawing the invention has been shown by way of example,

Fig. 1 representing therein a side view of a loudspeaker with a soundradiator in accordance with the invention, partly in section.

Fig. 2 is a plan view of the sound radiator in accordance with Fig. 1.

Fig. 3 diagrammatically illustrates the production of the soundradiator.

In the drawing (1. represents a yoke of an electro-magnet. Thiselectro-magnet has been equipped with coils b. c indicates a metallicdiaphragm, freely carrying over a pin d a sound radiator f. Usingpressure disks, the sound radiator f is fixed over a screw connection bymeans of the pin d. The sound radiator 1 consists of veneer wood. Asshown by Fig. 2, the veinage of the veneering wood takes a radialcourse. The entire sound radiator f consists of veneer spirally paredoff. Such a spiral-shaped veneer is obtained, for instance, by paringoff a wood trunk by means of a cutter which is rotatable conically ofthe axis of the trunk and slidably mounted in the direction of the axisthereof, as described in United States Patent No. 1,807,251. Theprinciple of producing the spiral-shaped veneer is obvious from Fig. 3.h indicates a blank (workpiece) of wood which may be moved forward inthe direction of the arrow A. 2' is a cutter which is secured in aconical holder is adapted to rotate about the axis 102 of the blank(workpiece) by means of a pinion 701. During the simultaneous rotationof the cutter i and forward movement of the blank h, an endlessspiral-shaped veneer m is produced which may be suitably cut and shapedin accordance with the diaphragm f. The joint g is of the swallow-tailtype. In order to provide a compensation for the joint 9, the soundradiator may be made to consist of two equally shaped veneer disks, thejoints of which are staggered by 180.

The mode of acting of the arrangement is as follows:

The alternate current fed to the coils b causes the diaphragm c tovibrate. The vibrations of the diaphragm c are transmitted to the soundradiator f. Owing to the radially running veinage of the sound radiatora particularly pure reproduction of the musical sound is ensured. Thesound radiator may also be composed of separate wooden sectors. The onlyessential feature is that the veinage takes a radial course.

I claim:

1. In a sound generator a support, on the support a sound radiator,means for causing the support to vibrate, said sound radiator consistingof sections of wood, the veinage of each section substantially taking aradial course.

2. In a sound generator in accordance with claim 1, the sound radiatorconsisting of a veneer leaf with wavy running joint.

3. In a sound generator in accordance with claim 1, said meansconsisting of an electro-magnetic system.

4. In a sound generator in accordance with claim 1, the support beingconcentrically fixed to the sound radiator.

5. In combination, a vibratory member, a sound radiator securedcentrally to said vibratory member, said radiator being formed ofsections of wood, each section having the grain thereof disposedradially from the point of connection of the radiator with the vibratorymember.

6. In combination, a sound radiator, means for causing the radiator tovibrate, said radiator containing a diaphragm part of an integral pieceof wood, the grain of which is disposed radially.

'7. In combination, a sound radiator, means for causing the radiator tovibrate, said radiator consisting of wood, each grain line of whichbeing substantially disposed radially.

8. A reproducer diaphragm containing an integral sheet of wood, thegrain of which being in convergence toward the center for uniformvibration.

9. A reproducer diaphragm containing a sheet of wood symmetricallyarranged to the center of vibration, the joint of said sheet running ina wavy line.

FRANZ OVENHAUSEN.

